Improvement in joints for sheet-metal pipes



NITED STATES IMPROVEMENT IN JOINTS FOR SHEET-METAL PIPES.

Specification forming part'of Letters Patent No. 159,4 39, datedFebruary 2, 1875; application filed July s, 1873.

To all lwhom it may concern Be it known that l, J osEPH Moonn, of SanFrancisco, in the county of San Francisco and State of California, haveinvented an Improved Pipe-Joint for Sheet-Metal Water-Pipes; and I dohereby declare that the following is a full, clear, and exactdescription and specification of the same, reference being had totheaccompanying drawings, in which- Figure l is a longitudinal section of aportion of pipe, showing the joint; and Fig. 2 is a transverse section.

Similar letters of reference indicate the same parts.

heretofore sheet-iron water-pipes have been connected or jointed eitherby means of dan ges riveted on each end of the pipe sections and boltedtogether, or, by means of bell-joints, riveted onto the end of onesection, into which the plain end of the other section is inserted andthe joint packed with lead in the same manner as is ordinarily done withcast-iron pipes. The latter method, being the cheapest, has been oftentried, and, for light water-pressures, is, to a certain extent,successful; but the pressure of the water in the pipe, acting upon thesurface of the lead in a line with the length of the pipe, usuallyexpels the lea'd packing from the joint and causes the joint to leak. Itwas to overcome this defect in this class of pipes that my invention wasmade, and, after the most thorough course of practical experiment andtrial, it is found to be completely successful.

The invention consists in combining, with the different sections orlengths of a sheet-iron water-pipe, a strengthening ring or flangeinside ofthe pipe to support the ends of the sections while the leadpacking is being tamped in, and to prevent the lead from ruiming throughbetween the ends of said sections; an outside band or tube 5 and a leadpacking introduced into the space between the pipe and the outer tubingor band and tamped firmly into said space, as I will proceed to describeby reference to the drawings.

In the latter, A and B are two sections or lengths of sheet-ironwater-pipe, which are brought together to form a joint. O is the insidering, usually made of sheet-iron of sufflcient thickness to withstandthe pressure caused by calking or tamping the lead. This ring isfastened to the end of one of the pipesections by rivets which hold itin place, or by other suitable means, and the end of vthe other sectionis usually shoved over it. The ring is ordinarily from four to fiveinches wide (longitudinall y ofthe pipe) and one number thicker than theiron of which the pipe is made. E is the outer band or section oftubing, made from three and one-half to live inches wide, usually abouttwo numbers thicker than the iron of which the pipe is made, and aboutfrom three-fourths to seven-eighths of an inch larger in internaldiameter than the outside of the pipe. D is the lead packing or joint,extending continuously from one side of the band E to the other, andmade by pouring the lead into the space between E and A B, and calkingor tamping it firmly into said space in the manner usual with cast-ironpipes, as above set forth.

I am aware of the state of the art in the construction of joints forpipes of paper, cement, cast-iron, and other similar materials, and donot claim the same; nor do I claim, broadly, the use of any one of thematerials herein referred to for the manufacture of pipejoints; but

What .I claim as new, and desire to secure by Letters Patent, is-

In a sheet-iron waterpipe, the internal strengthening ring or flange O,secured to one of the two'sections of pipe A B, and combined with theopposite section, the oute` band, E, and. the packing D of lend, thelatter being tamped lirmly into the space between the parts A, B, and E,so as to afford a continuous lead covering over the joint and to somedistance on each side, strengthened oy an iron hoop outside,substantially as and for the purposes set forth.

In witness whereof I have hereunto set my hand and seal.

JOSEPH MOORE. [1.. s] Witnesses:

C. W. M. SMITH, Unas. G. WEssELL.

